Sumiyoshi double tendon

prusaprinters

Sumiyoshi double tendon, a Japanese joinery style discovered by Sumiyoshi. Not much is known about this joinery, though more common than unique one I modeled earlier. I could not find more mentions, however.Modeling this one was much harder, since inside is quite complex, since dovetail have to slide in and upwards, then click in place. My first model, female was completely missing a feature so I couldn't even start to insert male joinery part. After designing that in, I realized that joinery sides is much more complex than I expected. I had to manually move male part into female in model so I can catch overlaps and adjust model some more. Ultimately while it worked, I am not certain on how accurate my model, in least in those areas. Most of it is certainly accurate. On male, I decided to follow modern design of adding hole at where sharp slopes meet in middle. It helps printed model to click together perfectly also. But for wood joinery, it stops any possibility of cracking there. I found this video, and like mysterious one, I wanted to make a model of it. I found paper at same source as other one, so print isn't best quality.What a complex cuts in order to make it. Printing is much simpler, since you can just download this model.In order to print this, Best choice is to have male joinery part pointing upwards. For female, have inside wedge side touch bed so its much easier to print. Neither needs any support. I printed at stock profile, .3 mm layer, 15% infill. But honestly I'm sure you can get away with less infill, depending on top and bottom layers. It was fun modeling this, even with first female print failing due to me completely missing a male dovetail top entry point shape feature. Apologies on fairly bad print on female side, my printer slightly clogged while printing.